Opal is October  Birthstone.

 Exact Carat Total Weight:    ( Silver + Stone)  16.35 ct,   3.27 gram.
   
Shape:   Natural very flashing High Quality Ethiopian fire Opal  14.0 mm x 11.0 mm x 6.19 mm = 4.60 ct. 
Color:    Very flashing
Clarity:   IF - Transparent.
Luster:    Beautiful
Treatment:   Unheated.
Origin:      Ethiopian  
Hardness:   6.0.
Ring Size;     6.0
 Face Ring :   14,0 mm x 19.0 mm.
                 
Item is in excellent condition, and it can be great gift to your daughter, yourself  or someone you love.